Steam-generator



(No Model.)

B. HURST. STEAM GENERATOR.

No. 439,663. Patented Nov. 4, 1890.

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UNITED STATES PATENT OF ICE.

DAVID HURST, OE MANSFIELD, OHIO.

STEAM-GENERATOR.

SPECIFICATION forming part of Letters Patent N 0. 439,663, datedNovember 4, 1890. Application filed February 19, 1890' Serial No.341,037. (No model.)

To all whom it may concern.-

Be it known that 1, DAVID HURST, of Mansfield,in the county of Richlandand State of Ohio, have invented certain new and useful Improvements inSteam-Generators; and I do hereby declare the following to bee full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it pertains to make and use the same.

My invention relates to improvements in steam-generators; and itconsists in certain features of construction, and in combination ofparts hereinafter described, and pointed out in the claim.

The accompanying drawing is a side elevation, partly in section.

A A represent upright steam-boilers -ar ranged side by side andsupported, preferably, by mason-work, as shown. At the lower extremes ofthese boilers are located fire-pots B, provided with grates h and withflanges b for engaging the mason-work, whereby the fire-pots aresupported. Ash-pit doors B are provided with dampers b Each boiler isprovided internally with a large upright conical tube A, inclosing acombustion-chamber A Tubes A are flanged outward, as shown at a, andconnect, respectively, with cylindrical tube A the latter joining thetop boil-- er-heads a. A jacket 0 incloses the two boilers and extendssome distance above the boilers for inclosing an air-chamber C the topwall or head of the jacket being shown at O.

D is a horizontal tubular heater, the tubes thereof being arranged inupper and lower series, as shown at- D' and D The heater is providedwith a hand-hole d and with induction and eduction pipes, respectively,d and d. A jacket E incloses the heater, thisjacket connecting with theupright jacket C and a door being provided at E for cleaning the tubesof the heater and for giving access to the hand-hole d in cleaning theshell of the heater. A smoke-box c has depending legs 0, that connectwith the upper end of tubes A. This smoke-box joins the heatersurrounding the ends of the lower series of tubes D The products ofcombustion, therefore, pass through the smoke-box, and from thencethrough the lower tubes of the heater into return-chamber E and fromthence through the upperseries of tubes, and from thence escape into thesmoke pipe or chimney F.

G G are air-tubes, these tubesabove opening into chamber 0 Theseair-tubes extend down centrally into the respective combustion-chambersand discharge above and toward the fuel, these tubes having enlargedheads g, preferably of the form shown, and having, preferably,detachable dischargingnozzles 9, that may be renewed from time to time.Tubes G above are provided with flanges G, that rest on the top wall ofthe smoke-box 0 around the holes that receive these air-tubes, theseflanges being large enough, and are provided with holes to accommodatesteam-pipe h. These steam-pipes are of thin copper, and are coiledaround tubes G, as shown, and enter head g and discharge downwardtherein.

H is a steam-pipe connecting with boilers A A, this steam-pipe having abranch H, provided with lateral branches H the latter being providedwith valves H and outside of these valves are attached the copper pipes77. h aforesaid. The valve-stems of valves H should extend outside thejacket, so that these valves may at any time be manipulated inregulating the flow of steam through the copper pipes. Pipe H leads tothe engine I, and the exhaust-pipe J of the engine may lead insidejacket 0 and extend up into chamber C and there provided with nozzles j,discharging, respectively, into the upper end of air-tubes GG, in whichcase the exhaust-pipe should have an extension J opening into theatmosphere, but provided with a back-pressure valve J or a valve of somekind to regulate the discharge of exhaust-steam through nozzles j. Thejackets O andE are provided with dampers K for admitting air. The airinside of these jackets becomes heated and accumulates in chamber 0 fromwhence the air-supply for supporting combustionis drawn through tubes GG by means of the steamblast from pipe h, the steam in these pipes beingsuperheated by reason of their exposure in the combustion-chamber. Onstarting a fire dampers b are opened to admit air under the grates; butafter a sufficient steampressure is produced in the boilers dampers Z2are closed, after which the air-supply is had only through pipes G G,these pipes, as aforesaid, discharging on top of the fuel. \Vith suchconstruction such perfect combustion is obtained that little or no smokeescapes through the chimney. Meantime what would otherwise be waste heatfrom the boiler is utilized in heating the feed-Water passing throughthe heater, a pump being used to force the water into the boiler, suchpump being in the line of the induction or eduction water-pipe, as maybe preferred.

What I claini is The combination, with steam-boilers, feedwater heater,and mechanism, substantially as indicated, for passing the products ofcombustion from the boilers through the heater tion, in the presence oftwo witnesses, this 10th 2 5 day of February, 1890.

DAVID IIURST. Witnesses:

FLORA M. KERR, S. S. HOUT.

